Răspuns :
x - ∞ -1 1 +∞
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x + 1 -- 0 + + +
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x -1 -- --- --- 0 + +
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+ 0 --- I + +
daca x∈ [ -1 ; 1 )
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x + 1 -- 0 + + +
------------------------------------------------------------------
x -1 -- --- --- 0 + +
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+ 0 --- I + +
daca x∈ [ -1 ; 1 )